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A clump of Staphylococcus epidermidis bacteria (left, in green) in the extracellular matrix, which connects cells and tissue, is shown under a scanning electron microscope. At right is the bacterium Enterococcus faecalis, which lives in the human gut. (Associated Press/National Institute of Allergy and Infectious Diseases and U.S. Department of Agriculture)

A clump of Staphylococcus epidermidis bacteria (left, in green) in the extracellular matrix, which connects cells and tissue, is shown under a scanning electron microscope. At right is the bacterium Enterococcus faecalis, which lives in the human gut. (Associated Press/National Institute of Allergy and Infectious Diseases and U.S. Department of Agriculture)

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